Translation of C struct to D

[Jerry]

Michael Kremser <mkspamx-usenet at yahoo.de> writes:

> Hi!
>
> I currently try to create a simple linux driver (for test purposes)
> just like in [1] in D based on [2]. The main difficulty is to call
> register_chrdev. It expects an argument "fops" of type file_operations
> which can look like that in C:
>
> static struct file_operations fops = {
> 	.read = device_read,
> 	.write = device_write,
> 	.open = device_open,
> 	.release = device_release
> };
>
> device_read and so on are functions. Originally, file_operations has
> much more fields and it's possible to omit unused fields.
>
> What I tried so far: I declared "register_chrdev" as follows:
>
> extern (C):
> int register_chrdev (uint major, char *name, file_operations *fops);
>
> My try for the translation of file_operations looks like that:
>
> struct file_operations {
> 	int function() open;
> 	int function() release;
> };
>
> In init_module() I have the following code:
>
> char[] DEVICE_NAME = "dtestdev";
> file_operations fops;
> fops.open = &device_open;
> fops.release = &device_close;
> Major = register_chrdev(0, std.string.toStringz(DEVICE_NAME), &fops);
>
> The code compiles with some warnings, and if I try to insert it into
> the kernel, I get some messages in the kernel log.
>
> WARNING: "_D3std6string9toStringzFAaZPa" [...../hello.ko] undefined!
> WARNING: "_Dmodule_ref" [...../hello.ko] undefined!
> WARNING: "_D15TypeInfo_Struct6__vtblZ" [...../hello.ko] undefined!
> WARNING: "register_chrdev" [...../hello.ko] undefined!
> WARNING: "_D3std6string12__ModuleInfoZ" [...../hello.ko] undefined!
>
> Nov 14 21:12:39 eeepc1104 kernel: [17127.068990] hello: Unknown symbol
> _D3std6string12__ModuleInfoZ (err 0)
> Nov 14 21:12:39 eeepc1104 kernel: [17127.069613] hello: Unknown symbol
> register_chrdev (err 0)
> Nov 14 21:12:39 eeepc1104 kernel: [17127.070462] hello: Unknown symbol
> _D15TypeInfo_Struct6__vtblZ (err 0)
> Nov 14 21:12:39 eeepc1104 kernel: [17127.071359] hello: Unknown symbol
> _Dmodule_ref (err 0)
> Nov 14 21:12:39 eeepc1104 kernel: [17127.072352] hello: Unknown symbol
> _D3std6string9toStringzFAaZPa (err 0)
>
> Any help greatly appreciated.

This looks like you don't have druntime or phobos linked into your
module code.  

Does the original C example work for you?